3) Draw a square with three lines
a) The edge of the paper does not constitute a 'side' of the square. You cannot bend a line into an 'L' shape to make two sides.
c) You can either draw & scan your answer, use 'Paint' or similar or
use dots & dashes to draw the solution.

...or alternatively, think them up yourself.
The answer to no.3 is in another question. The answer to no.2 is evident if you look at no.2. Still trying to figure out no.1. And I got this far without Googling!